Booting of LiveCD on new AMD processor-based workstation fails with Kernel pani

Hello,

we just assembled our new workstation based on a recent AMD Ryzen processor (AMD Ryzen 9 3900X) and try to install/try CAELinux from USB stick.
After selecting "try Xubuntu...", the computer freezes, ending with the following messages:

? rest_init+0x80/0x80
kernel_init+0xe/0x100
ret_from_fork+0x2c/0x40
Code: 41 5e 41 5f 5d c3 4c 63 ee 4a 8d 04 ed 00 00 00 00 4c 89 eb 48 c1 e3 08 48 29 c3 48 03 1d d1 92 c9 00 48 81 fb 00 f0 ff ff 77 b1 <48> 83 7b 10 00 75 aa 4c 8d bb e8 00 00 00 49 89 fe 4c 89 ff e8
RIP: pcc_mbox_request_channel+0x78/0x160 RSP: ffffb78886277bd0
CR2: 0000000000000010
---[ end trace 72ac56067c678cd0 ]---
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
Kernel Offset: 0x24000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009


We already tried to boot Xbuntu 16.04 from USB which worked flawlessly.

Any idea which could help us to get CAELinux run on our workstation?

Thank you in advance for your support and help